- ChengYi (Cheng Xiao and Xuan Yi)
- They were both born in China.
- They both have brown eyes.
- They both have black hair.
- They are both dancers.
- They both have a younger sibling.
- They are both in the sub-unit αγύρτης.
- They are both actresses.
- Xuan Yi was born in Hainan but Cheng Xiao was born in Shenzhen.
- Xuan Yi can play the piano but Cheng Xiao can play the guzheng.
- Xuan Yi has a younger brother but Cheng Xiao has a younger sister.
- Cheng Xiao was a mentor on Idol Producer but Xuan Yi was not.
- Xuan Yi is a member of Rocket Girls 101 but Cheng Xiao is not.
- Xuan Yi was born in 1995 but Cheng Xiao was born in 1998.
- Xuan Yi is in the sub-unit Joy but Cheng Xiao is in the sub-unit Wonder.
- They are both in the group Cosmic Girls.
- They are best friends. They appeared on the show Best Friends Perfect Vacation together.
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